it is there in most of the shops delaing with packing materials. For example the shops near shivajinagar who sells foam materials.
it is heavier than Depron/Thermaocol. i think it is 4gms/cm3 but practically indistructable.
ashta

Looks weird    But flies great ! 

From your flying, it seems like you are more than ready for (or have already started doing) "one maneuver at a time until you master it" type of practicing.  Basically, pick any one maneuver (flat-spins etc), try it on the sim till you have the basic stick movement figured out, and then go practice it out in the field.  Not only does it keeps your motivation in flying high (as you are trying to master something again and again), but it also makes you a "impressive flyer" as compared to a "good flyer" 

This is what I have been trying to do on the heli front for a while now. It is a great feeling to have mastered one another maneuver every once in a while, as opposed to just doing the same kind of flying again and again !

dear anwar,
very sensible suggestion. Thank you. i will surely try this. I think that, thats a good objective and doable.

ashta